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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f6e13b35d7c1a8967a98aeaa8d97eb5d74643887b91cf148198b22042941e7' 
  AND token = 'Jit0kTms3c+lbATiKTY2+WUQ5rJawKrW8geHOqi9EAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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