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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239313a5cc7f906cdccfae56d9e875b462d5e23beca7c2e802375db9be7d9c1a' 
  AND token = 'JO2Gu5Ouzqhn3fnclB2z2kGgpeZqdhLs2M7cTybhjd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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