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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b1feadefb56575fcfb730f9edfd5f99629b9a166285544a5ba1d1a81ae780d' 
  AND token = 'svCZwQf8O+6A/cb/frr4ME+UMMpTDSkeM59V8YEdlmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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