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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea67b120165fb0c31ec93621831b1ceab0a9a4b998cc4179bb2c555707be9bd0' 
  AND token = '6hlz9ACc3M5GShrzq4JdVE3Hg+dtZUKyjyvNv0jq4WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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