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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e117a908ec794fd30774dd1611bb36f45ab5f830a2f3fec472bcd761a03f3974' 
  AND token = '4NNTFWG06q0W7n0gqpCj8ZzsHa0Ewk3K31TIlfhU5d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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