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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1329d7f8b652b15177041ed9449cf71dd38c5c39985f233bd4d2686fb9a8df80' 
  AND token = 'XIwG/UoOIRkNsQYLtyZpr0r3WBgN4JeFPfkf7Yn1Cyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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