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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e062f533883db8c82cc175abf267fd6a9be2a4ebe4d8f1bb4bc0496765a911ec' 
  AND token = 'SYGStYmt353xuczH45u0qeGWnG5RCKYt45o+FeY0vHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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