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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6e4d975eaefef40963ab37ac4b91ddb8430c56bf5f833a37955eab86e32706' 
  AND token = 'uLWLP6nbwu7kCbrwyNPQ/tIN8ialpUr0cQ4SpMueuq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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