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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7eacf4ed5d6dfb459f580125df0e3b37de6e902a2376402c1911190fc57261f' 
  AND token = 'iO0yEvo0vyPlZ0LYOt7shXUIh0fwCo7M775LN6hGMzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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