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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70892672114c1ab9982809747b3d881c7dd08a5e639cd81c7c955d479dc9425b' 
  AND token = 'x1dmkmby7FUmSmeuPweNmZcBV3tObVbbKaHYfQlPzs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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