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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8dcab142953362539820edaa499a5f0ba565a8473eceea468544f9f1d782df' 
  AND token = 'CLqdVIBRr3DL8NF8Djyb0eBpyz3zBlkCSAkF/DoX5KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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