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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1f92b872b6951a4b30e63292b11ccb56ba27e284219e8bffa09d3f4c7cb6d3' 
  AND token = '136o6fJWCwaHb8wsXZN/V/AgH9tLZEMPzDXmigXkTOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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