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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c1476eb2e431b5ac33cf27234f683dec1524c8bdba9fbbb4d1bd52cd74d689' 
  AND token = 'hbtjYWwRvqywQMiPmGHa+jv+GndyrNT3rDbRoC0bbqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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