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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7fb2a313b34ae276a7e6e293d42411c0a3c4ed197d17bd194f5968c6277c66' 
  AND token = 'mmTRvjFKuiKYrRd+Opj9dsByyAsny+fnH99BxuwjaH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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