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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860c55ab27bd902ce6c0d4ecf745f6dbcfadfb42fb671099889c66929787a2b8' 
  AND token = 'I/9+67CcmppxVkQG/dW+oBby4BQw7jVXwCsrMbWfyug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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