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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5555fcdb1d1b47f9966b7d2028b8e080953a929156969ca0cbc223f3d7e14998' 
  AND token = 'fHM55pCTOoHucO9S3yniXpf2wpM4Ux5JejT6kl2k9h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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