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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316d9bd304c1b72e8d66dc5c03d0dd6ae4f90db9151a09d1d0775117f7460e95' 
  AND token = 'Y6zfP3nZDEOuyP5iiTBzK7nK6491c5ZIH4ico440j9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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