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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790e4cddef38e3128652893d0350c1a6917257287d43c58606d3743cd76c543e' 
  AND token = 'JU97wJvZXRko1j/obo7XtG10ndA5IQhan0kujMIqYPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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