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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa886dcdb816c47d049392a2c3a9d54b5eee0bba098cf480f19c4e7ea913ba1' 
  AND token = 'fHg3awLR6PcntccphVRYX3ckjT7NZ569//3QSsOTD6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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