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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8045558bf1ae91eaa09e66f1f7038c7cf14cb851fe553e95e8355e25e0348ae7' 
  AND token = 'F6/l+AlXWbu0UzPEL63RPdXJaIGDzSzrGOFRxlLUhSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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