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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405d1ac51ad40da2a29e28030d6a05835dab6b2faaa01fb630683f6ce1ef330b' 
  AND token = 'jvE3KGO81n05sQ3M20ZuksPNjv5EKU3q+cIMOOBck8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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