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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcc7acbcbab53f77e66445c21d046a7c8494d0ed77b5c540a6ee091ab790e5d' 
  AND token = '0E/xGj9y9epLyPeUHtHVvzYXIDF0sVINOSy3cWNdlqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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