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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b946b99cfbb5f5759b8d5f0c1018cff22515e3df08457fbb6493b7402faeaffe' 
  AND token = 'FKsZzCnkS3qHiV1a9ezCo8JRpQLM1UAhpz673axcFEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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