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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962a9a08b5db5a828b1d23e856623219abce71d5638c08987886d0000be0ecce' 
  AND token = '3BhXrg4WY4qsSVtzPv/bk1Kt1awEneHi2+1UQy5Egjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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