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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6f74f5d64b77ed6bab2ec6365009c6b62e265a32e9e44860620db1fad0fa1d' 
  AND token = '6Yg+Jw4rsvh7rdPBIk+pWm+wgIooxXRMu9Py6EayImY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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