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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7def2dd09840fe8368bcc4331e95b7663142ba9ac39b16868c8d901afbc88cb' 
  AND token = '3N5YY1tVP6YN+CYChlASI8b3MjhhbLxqELf/yRusfV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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