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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55b112838f51b309cf25c2c98ce3099d8fd8974cb5607743757d73ff77b9fb9' 
  AND token = '1JxHPDKTS6NxybhE4xh4RzStxMswysQG7p04bYiFMQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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