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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6ea4f1615790ab969aa68052aaf7a2f9e28241468d8ef6e2b1feb9f538a91f' 
  AND token = 'aE8J/VTlP+s6P+CnmNvGuQLDlIN4dtw+dYBC6FteozM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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