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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575a9c1c4194a3e1f0a11b0900a7912e422d0ea4561f1861e645be1d5d61d7e0' 
  AND token = 'DuG8pL5jnA9yZ3Fqs9ucQ4PDh1J5yL1lh4dNNYQDYLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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