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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046806756f08dcf47cb395e920fa28abe02dda49c1be6ba6ea077d3bdf34adfc' 
  AND token = 'i6CrCikSIgbGA5XwV0biBhg1gfoVfxjQbFenhMvkWYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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