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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf24004b4bc9b672e927d6e072a821d493df090d0ab0be12f5d0665e59ac1c7' 
  AND token = 'nxOtSRKjUuKBtA6g0Cf9pqzVnORjtrqLn4seEl032Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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