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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a54593a11cb093f66a23f3f8c7f76104b6e4f1816614de9f3ed6bb68305aba' 
  AND token = '31rr2I+3pJPYl+nwcapHfyHH2cNwxwYSH7dZQeYF/VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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