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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8ae30a79a7f5dd1a337706e62e8a76ea8fefac9555df51fc791e61cbc0b58d' 
  AND token = 'Tti3F6NPYJN85MoWU4HTXDGQb/E2OZszcF37XrgA2tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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