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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bf04e9339bebc27301979e111933b2c2c9bca27d89c59552f8bd801eb67dbe' 
  AND token = 'YJeuQ3jvBCLPAiqot4M1jRN9fNaWLxEgR22U655r9Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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