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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9033d3dec783b93c96962cd4a0b3cf1d8a418e77cdcbf0843a16f0920df1dc4b' 
  AND token = 'f/fpGrsllr+0TKvZ8zUxDye9J7CrF/jVppbCnNntGGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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