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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5048eb484e474bc394725e323a0bada32f8a498f0e3cc5ebd8609e71b494053e' 
  AND token = 'a7y052ktaGILGz8CFxuZ4xfeUiyGPYyCwN1r/wQh3wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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