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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090e45a0364f82aa211abe14f480bd44513e3990576119af77184e425755a5b0' 
  AND token = 'ulyg9fapMd+uGHG9A8kDLe9PLjKzcjWZ6IW8bnm3Ibs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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