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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e36de07821cd461df38fcc3f30731a32f4c63b7875031233ee127ea57445b8' 
  AND token = 'SVhTAWQHl1818irpmuP5muEuUz4cf5PJsMNmYTEYQ54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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