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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e3010af65032494783cdac87b7e59a667b951690d54fe08602bf0a9193e336' 
  AND token = '9h2HcHRthBATBgIc/KAjtiM6jn9Gf3p6FoRrHzvCyWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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