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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0287452a2e6431bf34aa94c684b719aaeab611ea80c61478df8914b85f8a98' 
  AND token = 'EpgXzR5w3gNgcYhiUvNAzF8VRXclQ4ffYRlJdHyD+jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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