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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd8e64572145ebc621adeae196fc639bf888d0ea19b2e7d693f21e0a8fc3280' 
  AND token = '/86ttAzluR0p0fqBqC9tnypa4CuDiJm3amwouRdx8ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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