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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e007d066a8cbdc49f393aabdb876a96a6b1208782d62c570567d3cb4c065be53' 
  AND token = '84K1XuBpqZ64nqrczrSBu15nqkd0YnhisvPTxSWPT1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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