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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f1b093dfced5dfa53eae1de51fc290915969d11ab3082b7d3f54adcdf93207' 
  AND token = 'AnqFznPV4kwRawOttXvwhdIQwerSo5g8WO2QR/5au5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}