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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94de7d376357c947e6b12c8b77c28ca4893596ad65f1fea51a7f40feff22a683' 
  AND token = 'ffyP/+TKN7wOmpMPQLTLc6Eq0bsjNJEXEk0/p06sFkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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