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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c861d9eaf67330a78732c69e2e618d4204bc898fb7bab95f38715eecd07b59b' 
  AND token = 'fpwDdnoaQo18M8ygABqgVpLcC0iNys4wepKsY0J+RUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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