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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c33c72d9cec12d541c36a65cc037105bb9e13d16da0e9daf4c152629b3b1839' 
  AND token = 'MYzlH3anHHKVqVr1QpdKJWqL4tD2BDrqi3tpVdcOOcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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