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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfbed041987bc3495ba2cbe6673f6876a569f3f9fa455f505c244197ef6c9ce' 
  AND token = 'eDP3y8x9VbBqeSd00BQc8W1FhaotXot3s/xvPfJQvPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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