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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240c7db1135fece40cc016fa66d954713f9744d855cebc45fad5e0309bfd1f81' 
  AND token = 'xHSKeOUqw9UII5cLBccwQScp0Kt1y1Ot/AnBEEvS6Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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