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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9415614b708a4d2f58917a8d163884f492fd5100c2f7d0094fdc312d915650' 
  AND token = 'LZEgpaHoC9RMmYjvbVorGrP2N957Om9I/I2A29crhCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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