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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695d49b6d7f513daff7610ce0632503272cd5f466a07989475ba15b643af86ef' 
  AND token = 'quqLRJA3uKTLRKMySd4xXMXIPdgI70FI/mrpsx7wVww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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