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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3067eb85ec1a4c9b84cf83ba9f938eebf4c8dc5007198693c2bbb828c08413' 
  AND token = 'E3+kB3pgi+fuWmCznhYlUVrECmfKW5+MmyZCyAX2yA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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