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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9775a92cc99bded7060d77b5125720dab10e403fb3c721d46ac9d960147d428b' 
  AND token = 'YL2rfgtjk20qTUtVZj6zCg3zPIlsp3tTR6cF26SACgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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