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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923ee5a2bf799c0fcb49d34508578b3e0566e833042cf79696ca937ab7836e2e' 
  AND token = 'W23YOLUkfYHEMHe9izJgMiS4arKxBoTNgAvUZLkzrZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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