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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d942bfabd3d1a7950e0f7aa55bf154d516fc5116878296a0c5e08c8f2368107' 
  AND token = '8HE3Agn44fbyOjULN7zNFvmCoiPtPiEjjd8lZOQpN94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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