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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f09684ca47e49612aeedfedd7661ad03c10fd6c09f52ae1f87d871b137a62e' 
  AND token = '5gbwmQTyPi5fEh2XLZjARnb30S3mAVLyYoX8f31UlUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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