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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b51f70e9cc443b95c14dd57c98953b9b334a9e7fe1ed5cf6db7e40437a7539' 
  AND token = '8M8FFSInVZyGCTq+TqGFWNNaVY6yg2mGJsUmjO5STOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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