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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fc63e6854d237bad85265075eee7dc0e5013b119038aa1ec8c6f9a598841c5' 
  AND token = 'SwNgmLGDeNox850W1DcHWlwg4eGtJrqX+QmJqBfV8AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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