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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91f71a1a29764a8b47b0d8685ca0abbe2730f4c8940c3915cb55f2ba0c28f5e' 
  AND token = 'ZJEiwy/OUcuFufXXrPR1JMX6wyN5rT04uY2SqY0adYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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