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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04460822dc0f1dc60094e6c48935320b315dfe0e5f1893d15e47993ecf6e37c4' 
  AND token = '86YHRvTMmfHSLCG4rDR2Wk63VJq9MPbqGh8tpRMk1pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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