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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3b730c6c9d6aaee0e27b58aa82d9bdc2624e0a89bf3ffa15078a74c157b104' 
  AND token = 'G652ZJlb8dbbCuq6zcsk8zjh9L3z7o9+T47EL3MHiQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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