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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc980baa49f40dcf21cdaf9e2b7a2b2c309c5ffa6c9071e45713257e7f03952' 
  AND token = '/L7bh2SlTlxrdkZf3deGXlKqpFks3EeWgsUKa7gjglI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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