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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875cd01a6f6510ddb5fd70ba564b370bac249fb6ffed147e15b6ad9dfa0c9b55' 
  AND token = 'ZWiHZ7RPSPGLMJBhC0TChHIJCYmVX6WpP7ki+Q8MYuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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