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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac60407f8227e0f4704a20452c524d605ade6522f1d0aa55dfdfd83d2e0fe5f0' 
  AND token = 'DOUf/km0dGuwzbMKUiXkgcWI4cStm9WMxGJV1Yhym10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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