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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf8bc8735435ce918b034d9fc09099c65532df3f4a10a53d4c8e5cd07e1d3e4' 
  AND token = 'xOUXRz2V1U3KIw5jwSrdO/3BYdcVxXvD9vBDmdvQXlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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