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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d352fe05dfa6bf055ef16a3288a61f73b9e5a52310215237deddcc55c388388' 
  AND token = 'uf4GMjJmPERZh/VGxa/d8NgQh20ixqQ9MnQlNDDXpcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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