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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72f71abc30a9ae5d103023e6f4319823ce737fb4caea5876b3814faa9117e6a' 
  AND token = 'VdtKcMYFve7b1lgafJn75NYjDgJXvl5jZXSQCNmT4a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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