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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86391c24c77787f97cb88bca6e2f8ede173c4495afa69dccb3b7c2cf13cb79a5' 
  AND token = '+TUbYlYjfjJOP037SSE2EbJ0BEiTjBSppXa4cxlqSRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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