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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1192afa5cdee26640621b40fd2e53edb4543cd79938a80b2c428f981a8e9aece' 
  AND token = 'w5zS6sgHc9gU3Jt32jVkoNrq7DXyYArX3JqRJlPniog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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