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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab0e2444f7556d68703d8bf8088b62c60e790f344095f5f0de036fab6a13fdc' 
  AND token = 'FvVHVSpYLii/Z2YuPJga4C4rWUaJ8Dbw37opao8R8ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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