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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e9f0dae468c9fc2ebf35a2648a7b4b064c455e2bf7a0c85658ef0e9256787e' 
  AND token = 'KenaLbGj/PbhE63lK1OMyNljsXYi03cMU3lAhCLzztE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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